Question

In C programming sometimes I see

int main(void)

and then

int main ()

So what is the difference?

Answer 1

there is no difference, "void" means you are not going to take arguments. so either way is ok.

Answer 2

int main(void) means your your main is an integer type, logically you have to return an integer value so you have to put return 0 at the end of the function. the parameter void means you are not passing any value.

int main() is just the same as int main(void).

Answer 3

@pangyaPrice thats correct

Answer 4

In C, each function header has 3 sections: the type of date that the function returns, the name of the function, the argument list being passed to the function when it's called. main() is a function, slightly different than others, but still a function. main() syntactically should be:

int main( int argc, char* argv[] )

argc is the number of command line arguments that were used calling the program, argv[] is the array of those args. So in the case of a command like:

cd Desktop

argc = 2, argv[ 0 ] = "cd", argv[ 1 ] = "Desktop".

If no command line arguments are expected, programmers will just skip the argc/argv stuff. Leaving it blank raises the question to anyone reading the code "Is this blank on purpose?", so some programmers will put void in to indicate "yeh, I meant to do this".